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I have been facing with the 'Error91' randomly, not sure why? Though I have seen some posts on the forum regarding error91, couldn't end up concluding it. As u can see the attachment, the 'DB Tools Select.vi' is being used to retrieve the data from a table(am sure that table has no Null values). The Vi runs perfect for few days and falls with error 91 later at 'Variant To Data', which is circled in red.